20205400 has 24 divisors (see below), whose sum is σ = 46978020. Its totient is φ = 8082080.

The previous prime is 20205389. The next prime is 20205467. The reversal of 20205400 is 450202.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50314 + ... + 50713.

Almost surely, 2^20205400 is an apocalyptic number.

20205400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20205400 is an abundant number, since it is smaller than the sum of its proper divisors (26772620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20205400 is a wasteful number, since it uses less digits than its factorization.

20205400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101043 (or 101034 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 20205400 is about 4495.0417128209. The cubic root of 20205400 is about 272.3678342334.

Adding to 20205400 its reverse (450202), we get a palindrome (20655602).

The spelling of 20205400 in words is "twenty million, two hundred five thousand, four hundred".